Front fork

Details Front fork Front fork

2005-12-06

2005-12-06

Schwartz, Chris (Department: 3683)

Brakes

Internal-resistance motion retarder

Having a thrust member with a variable volume chamber

C188S315000, C280S276000

Reexamination Certificate

active

06971493

ABSTRACT:
This invention provides a front fork that can be efficiently be filled with oil when it is manufactured. To achieve this object, the front fork comprising: an outer tube (1); an inner tube (2) inserted expansibly and contractibly into the outer tube (1); a double-rod damper (70) disposed inside the outer tube (1) and the inner tube (2), the double-rod damper (70) including an upper chamber (3a) and a lower chamber (3b) defined therein into which that oil is contained; and a fork-inside oil chamber (71) defined by the outer tube (1), the inner tube (2), and the double-rod damper (70), into which oil and air are contained, the front fork comprising: a check valve (24) disposed in a lower portion (3b) of the double-rod damper (70), the check valve (24) allowing only one-way flow of oil from the fork-inside oil chamber (71) to the lower chamber (3b) of the double-rod damper (70); and an air vent passage (25) of a small sectional area disposed in an upper portion of the double-rod damper (70), the air vent passage (25) communicating the upper chamber (3a) of the double-rod damper (70) with the fork-inside oil chamber (71).

REFERENCES:
patent: 3024874 (1962-03-01), De Koning et al.
patent: 3966030 (1976-06-01), Sirven
patent: 4084668 (1978-04-01), Rybicki
patent: 4262779 (1981-04-01), Katsumori et al.
patent: 4280600 (1981-07-01), Salmon et al.
patent: 5347771 (1994-09-01), Kobori et al.
patent: 6244609 (2001-06-01), Wilson
patent: 1-80842 (1989-05-01), None

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